[...] The wage does not pay for labour, but rather for the disposal of labour-power for a specific period of time. During working time, the enterprise applies labour in order to make a profit – that is to say, to extract output from the workers that has a monetary value greater than that which they receive as a wage. That is possible because only the disposal over the ability to perform labour (labour-power) is paid, and the workers do not receive a wage corresponding to the value product produced by their labour. That is how it is possible in the first place that the success of the business can be measured in terms of profits – in terms of that which the workers precisely do not receive: surplus-labour. The struggle for shares of social income occurs permanently, its foundation is a negative dependence: capital and labour need each other, but at the same time stand in opposition to each other.